Emergency check-valve.



E. V. ANDERSON. EMERGENCY CHECK VALVE. APPLICATION FILED Nov.4, 1912.

Patented Oct. 13, 1914.

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C? 1 W VMWMINVENTOH wn'NEssEs r UNITED sTATEs PATENT oEEIcE.

EDWARD v. ANDERSON, or MoNEssoN, PENNSYLVANIA, AssIeNoR orv ONE-HALF To CHARLES E. GOLDEN, 0F GRAFTON, PENNSYLVANIA.

. EMERGENoY CHECK-VALVE.

Speccation of Letters Patent.

Application filed November 4, 1912. Serial N o. 729,525.

To all whom t may concern.'

.Be it known that I, EDWARD V. ANDERSON, a citizen of the United States, residing at Monesson, Pennsylvania, have invented cer-- tain new and useful -Improvements in Emergency Check-Valves, of which the following is a specifcatio My invention relates to valves for controlling iiuids and its primary object is to provide an automatic valve which will close when the difference in pressure `on the two.

a vertical longitudinal section through a casing supplied with my invention, andI Fig. 2 is a vertical section at right angles to that of Fig, 1.l

Preferably 'by means. of spring toggle levers I arrange the valve to occupy an open position until a certain difference of pressure on the two sides of the valve is attained, whereupon the Valve is closed without water hammer and remains closed; meantime the sensitiveness of the valve is adjustable and the valve may be taken out without removing the `valve casing from the line. Thus in the accompanying drawing I represent a valve casing with the inlet A and dutlet B and having two valve seats a and b. An

K `pwardly extending .head C carries a sha-ft provided with a packing, and having a shank of angular section upon which fits an arm E .carrying a swinging valve F, which normally, in open position, stands as shown in Fig. l in a vertical position between the two valve seats.l On the outside of the shaft D, I provide a double lever arm whose up- Ward extension G carries a link g attached to a piston I-I in a-pivoted dashpot I mounted on the cap C of the' valve casing. The lower extension K of the lever on the shaft D carries a pin L which engages a slotted head m of a collapsible cylinder comprising theparts M and N, the part N being piv oted on pin O on an arm attached to the valve casing.4 The inside cylinder M carries a coil spring P resting on a follower Q, which is adjustable in position .bymeans of a bearing pin R passing through the lower end of the outside cylinder N. 1 The follower Q'has lugs working in slots in the cylinder N in order to prevent its turning. The main valve F is preferably pinned on to the arm E and "I provide a spring f to' take up any play of this pin.` The lvalve is of V 'shape as shown in lorder to neatly fit either one of the valve seats.

In the fiow of fluid in the direction of the arrow in Fig. l, the valve F willnormally stand in a` middle position without-seriously obstructing the passage, vthe pressure on the lefthand face being met by the resistance of the pin L of the arm Kto downward movement against spring P, because the distance from the center of shaft Dto the center of shaft O is less than the sum of the effected lengths of arm K and the lever formed by the cylindersM and N inexpanded condi- .tion. By adjusting the pin R, the force necessary to overcome thevspring` toggle links .may bev adjusted. If a break in the line to the right of Fig, 1 should occur, reducing very much. the pressure .on the outlet side of the valve, therushing fluid carries the valve over against the seat o, depressing the spring Pthereby and carrying the pin L to the other side ofthe vertical-line between the two pivots of the toggle links, so that the valve will remain closed on seat b. In case of a sudden reduction vof pressure on the left side of the valve in Fig. l, the valve of course may close against the seat a, the

pin L rising out of the slotted head m, asl

indicated in dotted lines in. Fig. 1. Meantime, any movement of the valve F ischecked so as to prevent hammer bv means of the dashpot I-I, I;

It will be observed that the valve cannoty move suddenlyA in either direction; that the limiting pressure at which it moves 1s adjustable; and that the parts are outside the -valve casing for easy inspection and repair y and the valve itself may be taken out without removing the casing from the line.

The device is 'very simple and effective and its advantages' will be readily apparent to those familiar with the .art.' y

Having thus described my invention and illustrated its use, what I` claim is 1. In valve mechanism, the' combination of a casing havingftwopfvalvefseats, @aL- valve ona pivot shaft. inthecasingvand mounted to swing' against j eitherseat, aflever-r arm Viixedhon the pivot vshaft of the valve, a colratented oet. 13,1914.

lapsible elastic member pivoted to the casing and pivoted to said arm, the said member and arm forming a pair of toggle links adapted to hold the valve normally in position off both valve seats.

2. In valve mechanisrm the combination of a valve casing having two valve seats, a shaft in the casing, a swinging valve carried rigidly on the shaft in position to swing against either of said seats, an arm on said shaft outside. the casing, a plunger pivoted to said arm, a dashpot pivoted on the casing and coperating with said plunger, a second arm on said shaft, a cylinder pivoted to said arm, a cooperating telescoping cylinder pivoted on the valve casing, and al1 adjustable spring therein holding said telescoping cylinders in expanded condition so'that the cylinders and arm form adjustable spring toggle levers to hold the 'valve in normally open position or to hold it closed, substantially as described.

3. A double check-valve comprising a 'casing with two seats, a piVo'ted Valve xed on a rock shaft, spring .toggle levers attached to said shaft and adapted to permit the valve to close against the seat on the inow side of the casing, or to hold the valve against the seat onthe outflow side when the difference in pressure between two sides surpasses a given and adjustable value, substantially as described.

In testimony whereof I have hereunto signed myname in the-presence of the two subscribed witnesses.

EDWARD V. ANDERsoN.

Witnesses:

FREDK. STAUB, W. A. HICKMAN. 

